Jacobs Journal of Materials Science

Green synthesis of Spinel ZnCo2O4 nanomaterial via Moringa Oleifera as high electrochemical electrode for supercapacitors

Published on: 2018-07-22

Abstract

Mixed transition metal oxides with a normal spinel structure are considered as the most promising electrodes for high-performance hybrid supercapacitors due to their better electro-activity and superior supercapacitors properties than those of single metal oxides. Here, we demonstrated for the first time the fabrication of ZnCo2 O4 nanomaterials via a green synthetic way using Moringa Olefeira extract for high electrochemical supercapacitors. The supercapacitor based on Ni/ZnCo2O4 nanomaterial generated outstanding electrochemical performance with a high specific capacitance of 745 F/g at 10 mV/s and 929 F/g at a discharge current density of at 1 A/g, respectively. Based on electrochemical impedance spectroscopy (EIS), the pseudo-capacitive characteristics of the Ni/ZnCo3 O4 electrode revealed by a small semicircle and Warburg impedance, indicating that the electrochemical process on the surface electrode is kinetically and diffusion controlled. Based on this high specific capacitance and excellent electrochemical performance suggest that Ni/ZnCo2 O4 nanomaterial is a promising electrode material for supercapacitors.

Keywords

Biomaterial, Supercapacitors, Nanostructure, Moringa Oleifera, Green synthesis, Spinel ZnCo2 O4, electrochemical